Low Temperature Physics: 45, 894 (2019); https://doi.org/10.1063/1.5116538
Fizika Nizkikh Temperatur: Volume 45, Number 8 (August 2019), p. 1045-1052    ( to contents , go back )

On the magnetoelectric effect in paramagnetic NH2(CH3)2Al1–xCrx(SO4)2·6H2O crystals

V. Kapustianyk1,2, N. Loboda2, Yu. Eliyashevskyy2, and S. Semak2

1Scientific-Technical and Educational Center of Low-Temperature Studies, Ivan Franko National University of Lviv 50 Dragomanova Str., Lviv 79005, Ukraine
E-mail: kapustianyk@yahoo.co.uk

2Department of Physics, Ivan Franko National University of Lviv, 50 Dragomanova Str., Lviv 79005, Ukraine
pos Анотація:

Received February 25, 2019, published online June 26, 2019

Abstract

The recently reported ability to induce and tune a sign of the magnetoelectric (ME) interactions in NH2(CH3)2Al1–xCrx(SO4)2·6H2O crystals as a function of Cr content is further investigated here. The ME coupling and its larger absolute value for the sample with larger Cr content agrees qualitatively with thermodynamic Landau analysis. However, quantitative estimation implies other contributions as well. The observed nontrivial magnetic field dependence of ferroelectric transition can be explained within the model that takes into account influence of the arising local deformation of the lattice on the two types of DMA group responsible respectively for the ferroelectric and antiferroelectric ordering.

Key words: magnetoelectric interaction, paramagnetic, ferroelectric transition.

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